Everanalog IC design EA3327DFR

The EA3327 is a dual channel power management IC. It integrates two synchronous buck converters and can provide high efficiency. The internal compensation architecture simplifies the application circuit design and the independent enable control makes the designer have the greatest flexibility to optimize timing for power sequencing purposes. All converters feature complete protection functions, including cycle-by-cycle current limit, short circuit protection, OTP and UVLO protection. The EA3327 is available in a tiny 12 pin DFN 3x3 package and can save the PCB area. The EA3327 is a PMIC which integrates a 40V input voltage range buck regulator (CH1) and a 5.5V input voltage range buck regulator (CH2). The CH1 buck regulator works in PWM mode at whole current range, which can provide the minimum voltage ripple. Each buck regulator has individual protection mechanism which includes cycle-by-cycle current limit, short circuit protection and UVLO. The EA3327 has channel lock mechanism. The CH2 buck regulator will not work unless the CH1 buck regulator turn on firstly. But the CH1 buck regulator can work independently. Both of the buck regulators are 1A load current spec. If the VIN2 is conected with VOUT1, the CH1 total load current capacity must reduce VIN2 input current. Both of the buck regulators have short circuit protection. The CH1 buck regulator implements hiccup mode short circuit protection and can reduce the short current substantially. The CH2 buck regulator implements frequency reduced short circuit protection. When the VOUT2 short condition happens, the CH2 switching frequency will reduce to 350KHz. The EA3327 has internal soft-start and delayed start-up function. The delay time between CH1 power on and CH2 power on is about 1ms. The EA3327 implements an internal OTP function. The device will shutdown if the internal junction temperature exceeds 165℃. Once the junction temperature decreases below 120℃, the device will restart automatically.

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